nohoho does a great job of keeping us up to date with what's going on in Japan with ST. Lots of videos included:
http://curryallergy.blogspot.com

If you can read Japanese, a fellow named Ichirou has a fantastic site:
http://www8.plala.or.jp/ichirou/hypersf2/

Tons of good translations and other data available at Sobat Carnival:
http://www.sobatcarnival.com/

Lots of great Super Turbo tournament videos have been uploaded to YouTube by superturbor:
http://www.youtube.com/user/superturbor

Shoryuken's Super Turbo Wiki:
http://www.shoryuken.com/wiki/index.php/Super_Street_Fighter_2_Turbo